Recommended spark plug for modified FZR

The stock FZR comes with NGK LFR6A spark plugs. When I asked R & D what they recommend for a modified ski, they said NGK LFR5A-11. I plan on putting them in next change (thanks Jerry for sourcing these). Just thought I would pass this on to everyone in this forum.

The stock FZR comes with NGK LFR6A spark plugs. When I asked R & D what they recommend for a modified ski, they said NGK LFR5A-11. I plan on putting them in next change (thanks Jerry for sourcing these). Just thought I would pass this on to everyone in this forum.

5 seems like a hot plug to me for a modded motor, I usally go with a cooler plug when modding with big boost or high compression.

For my mods i use stock plugs, But if i had very high boost i would go 1 number cooler like a 7
and the number 11 on the end means it's a 44 thousand gape you do not want that much gape with alot of boost don't forget stock is 34 to 36 thousands.

I'm thinking I read a year ago or so that the iridium plugs didn't work with our engines.

They work fine if you use one with the right gap. You can't re-gap iridium plugs, so you have to get them already with the correct gap.

I didn't just throw these in my ski either. Bill Chapin recommended them to me. If they're good enough for him, they're good enough for me. I think Desperado is using NGK Iridium Racing plugs as well as a few others.